British Prime Minister David Cameron departs Number 10 Downing Street on March 23, 2016 in London, England. David Cameron chaired a second Cobra meeting today in the wake of yesterday&#39;s Brussels attacks in which 34 people were killed. He said that UK security had been stepped up in the wake of &#39;a very real terror threat&#39; across Europe. Home Secretary Theresa May will make a statement to the House of Commons following Prime Minister&#39;s Questions.